How Hearing Loss and Cochlear Implantation Affect Verbal Working Memory: Evidence From Adolescents
Publication: Journal of Speech, Language, and Hearing Research
Volume 67, Number 6
Pages 1850-1867
Abstract
Purpose:
Verbal working memory is poorer for children with hearing loss than for peers with normal hearing (NH), even with cochlear implantation and early intervention. Poor verbal working memory can affect academic performance, especially in higher grades, making this deficit a significant problem. This study examined the stability of verbal working memory across middle childhood, tested working memory in adolescents with NH or cochlear implants (CIs), explored whether signal enhancement can improve verbal working memory, and tested two hypotheses proposed to explain the poor verbal working memory of children with hearing loss: (a) Diminished auditory experience directly affects executive functions, including working memory; (b) degraded auditory inputs inhibit children's abilities to recover the phonological structure needed for encoding verbal material into storage.
Design:
Fourteen-year-olds served as subjects: 55 with NH; 52 with CIs. Immediate serial recall tasks were used to assess working memory. Stimuli consisted of nonverbal, spatial stimuli and four kinds of verbal, acoustic stimuli: nonrhyming and rhyming words, and nonrhyming words with two kinds of signal enhancement: audiovisual and indexical. Analyses examined (a) stability of verbal working memory across middle childhood, (b) differences in verbal and nonverbal working memory, (c) effects of signal enhancement on recall, (d) phonological processing abilities, and (e) source of the diminished verbal working memory in adolescents with cochlear implants.
Results:
Verbal working memory remained stable across middle childhood. Adolescents across groups performed similarly for nonverbal stimuli, but those with CIs displayed poorer recall accuracy for verbal stimuli; signal enhancement did not improve recall. Poor phonological sensitivity largely accounted for the group effect.
Conclusions:
The central executive for working memory is not affected by hearing loss or cochlear implantation. Instead, the phonological deficit faced by adolescents with CIs denigrates the representation in storage and augmenting the signal does not help.
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Published In
Journal of Speech, Language, and Hearing Research
Volume 67 • Number 6 • 6 June 2024
Pages: 1850-1867
PubMed: 38713817
Copyright
Copyright © 2024 American Speech-Language-Hearing Association.
History
- Received: Jul 27, 2023
- Revised: Nov 9, 2023
- Accepted: Mar 20, 2024
- Published online: May 7, 2024
- Published in issue: Jun 6, 2024
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